Zayn previewed the duet by posting a black and white pic of himself with Swifty on his Instagram — but hey, she is bestiez with his girlfriend Gigi Hadid, so it wouldn't be unusual that they hang out… But collab?!

Another year, another endless current of commentary and communication from the 300-plus million users on Twitter.

Between the Rio Olympics, the presidential election, and Game Of Thrones, there was much to discuss in the digital zeitgeist — but which of the many topics trended the most?

Twitter just released the top trending topics and most popular tweets for 2016, giving an overview of the most talked about moments and movements over the past 12 months.

Aside from registering as the top TV show of the year, #GameofThrones came in at No. 10 on the top-trending topics worldwide. Star Wars earned the No. 1 spot in the top movies category, benefiting from the late 2015 release of The Force Awakens and this month's release, Rogue One.

While President-elect Donald Trump managed to become the No. 8 worldwide trending topic, it was Hillary Clinton who had one of the most retweeted posts of the year!

Clinton's post-election defeat tweet was the third most retweeted in 2016, following Harry Styles's birthday tweet quoting Taylor Swift's 22 coming in at No. 2.

The No. 1 retweeted post was from Spanish YouTube star and gamer Rubén Doblas Gundersen, whose "limonada" tweet was retweeted 1.38 million times after he promised prizes to fans who shared it. Hey, all's fair in love and social media!

Ch-ch-check out the top retweeted tweets and ALL the top trending topics of 2016 (below)!!

The 42-year-old revealed in the latest issue of Radio Times that he had unsuccessfully attempted to work with Bruno Mars and famed writer/producer Max Martin on his 2016 album The Heavy Entertainment Show.

However, the former boy band member admitted neither songsmith called him back.

But he did learn — apparently from Harry, himself — that the 1D star was working with BOTH hitmakers, recalling:

That's right. Photos of ballots have been circulating Twitter with voters writing in names of celebs like the former 1D singer, Selena Gomez, and even Harambe — the Gorilla who was tragically shot dead at the Cincinnati Zoo earlier this year.

These surprise nominees came from those who took advantage of the "write-in" section of their ballot, which allows the voter to add any name as their vote for President.

And those who weren't fans of either Drumpf or HRC were quick to pledge their allegiance to their favorite pop stars (or deceased zoo animals):

We already told you Khloé Kardashian revealed on Jimmy Kimmel's show that her little sis was given the lavish present — you know, the one she drunkenly forgot about — by "some random prince," who just so happens to be a family friend of the momager, Saygin Yalcin.

Us Weekly explained the KUWTKmatriarch's role in helping Saygin pull off the surprise: